Improvement in balanced slide-valves



WATSON.

BALANCED SLIDE VALVE. No. 178,393. Patented June 6, 1876..

Ammms.

N PETERS. FHOTO-LITIIOGRAPHER, WASm-NGTON, D C.

UNI ED STATES PATENT OFFICE.

JOHN EDWARD WATSON, OF LOUISVILLE,'KENTUGKY.

-IMPROVEMENT IN BALANCED SLIDE -VALVES.

Specification forming part of Letters Patent No. 178,393, dated June 6,1876; application filed April 18, 1876.

To all whom it may concern Be it known that I, JOHN E. WATSON, ofLouisville, in the county of Jefferson and State of Kentucky, haveinvented a new and Improved Balanced Slide-Valve, of which the followingis a specification:

The invention consists in the improvement of balanced slide-valves, bycombining a piston, diaphragm, and valve with a seat having port,passages, and channels leading from steam-inlet, substantially ashereinafter described.

The piston -rod may travel forward and backward under the support aboveit by a roller in its upper end, or by a vibrating rod bearing on orpivoted to its upper end, and also bearing against the support above thecenter of the course traveled by the valve.

The former arrangement is the one best adapted for a steam-engine, andthe latter is preferred for a steam-pump.

Figure l is a longitudinal sectional elevation of an engine constructedaccording to my invention, taken on the line 3/ y. Fig. 2. Fig.

' 2 is a transverse section on the line a; a' of Fig.

1. Fig. 3 is a section on line 2 z, and Fig. 4 is a detail section ofthe modification adapted for steam-pumps. Fig. 5 is a plan of the portsin the valve-seat.

Similar letters of reference indicate corresponding parts.

A is the valve, in which the live-steam ports B extend only a shortdistance upward from the bottom, and which receive the steam frompassages O, to which it is supplied through the valve-seat by thepassages D, which, in

this example, are cored around the cylinder to the chamber E, which thesteam enters at F. From port B there is a passage, I, admitting steaminto the chamber J, in which is a diaphragm, K, of thin copper or otherflexible metal, and above which is the piston L, the rod of which bearsagainst the support M by a roller, N, or a vibrating rod, 0. Thisdiaphragm takes the upward pressure of the steam, and has sufficientmovement to allow the valve to be pressed by the down pressure in saidchamber steam-tight on the seat, and the area of the chamber issufficiently larger than that on the under side of the "alve subject tolifting pressure to keep the valve tight. The valve works between raisedribs P, which keep it from working out of place laterally,

. and it works without a steam-chest, which is not needed in consequenceof receiving the steam through the seat below, on which it works.

When a single valve is used, it will have two inlets to the chamber J,as in Fig. 4, 7

instead of one, as in the double valve.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is----- The combination of piston L, diaphragmK, and valve A with seat, having port B, steampassages O O, and steamchannels leading from inlet F, all arranged substantially as and for thepurpose specified.

JOHN EDWARD WATSON. Witnesses: T. B. MOSHER, ALEX. F. ROBERTS-

